Device state control method and information processing apparatus

Abstract

A device state control method for use in an information processing apparatus that has a body, a device connectable to the body, a storage portion which stores information of a state of power supply to the device, the device state control method including: determining whether the information of state of power supply stored in the storage portion is information of power-supply OFF state or not, after instructing to shift the state of the power supply to the device from the power-supply OFF state into a power-supply ON state; and starting the power supply to the device, when the information of power-supply OFF state is stored in the storage portion.

1. A device state control method for use in an information processing apparatus that has a body with a slot, a device connectable to the slot, a controller configured to control a power supply from the information processing apparatus to the device, the device state control method comprising:
 detecting whether the device is connected to the slot; 
 turning ON the power supply when the device is detected as being connected to the slot; 
 turning OFF the power supply when the device is detected as being detached from the slot; and 
 receiving a command signal to turn the power supply ON or OFF; 
 wherein, upon receiving the command signal to turn OFF the power supply, sending a pseudo-signal indicating that the device is detached from the slot to the controller to turn off the power supply. 
 
   
   
     2. The device state control method according to  claim 1 , further comprising:
 bringing into a usable state, a bus controller which controls a bus connected with the device, after the power supply to the device has been started. 
 
   
   
     3. The device state control method according to  claim 1 , further comprising:
 opening a tray included in the device, after the power supply to the device has been started. 
 
   
   
     4. The device state control method according to  claim 1 , further comprising:
 displaying a content which signifies that the power supply state of the device is to be shifted from the power- supply OFF state into the power-supply ON state, the content is displayed before the determining and selected by an user. 
 
   
   
     5. An information processing apparatus comprising:
 a body; 
 a slot disposed in the body so that a device is detachably connected to the slot; 
 a detector configured to detect whether the device is connected to the slot; 
 a controller configured to control a power supply from the information processing apparatus to the device, the controller turning ON the power supply when the device is connected to the slot, the controller turning OFF the power supply when the device is detached from the slot; and 
 an interface to which a command signal to turn ON or OFF the power supply is input, 
 wherein, when the command signal to turn OFF the power supply is input to the interface, the interface sends a pseudo signal indicating that the device is detached from the slot to the controller to turn off the power supply. 
 
   
   
     6. The information processing apparatus according to  claim 5 , further comprising:
 a bus which is connected with the device; 
 a bus controller which controls the bus; and 
 a changing unit which brings into a usable state, the bus controller, after the power supply to the device has been started. 
 
   
   
     7. The information processing apparatus according to  claim 5 , wherein the device includes an openable tray; and
 the information processing apparatus further comprises: 
 an opening unit which opens the tray, after the power supply to the device has been started. 
 
   
   
     8. The information processing apparatus according to  claim 5 , further comprising:
 a display which displays content which signifies that the power supply state of the device is to be shifted from the power-supply OFF state into the power-supply ON state, the content is displayed before the determination and selected by an user. 
 
   
   
     9. An information processing apparatus comprising:
 a body having a slot; 
 a device which is detachably connected to the body via the slot; 
 a detector configured to detect whether the device is connected to the slot, and to store the connected device type; 
 a controller configured to control a power supply from the information processing apparatus to the device, the controller turning ON the power supply when the device is connected to the slot, the controller turning OFF the power supply when the device is detached from the slot; 
 an instruction unit which instructs to shift the power supply state of the device from a power-supply OFF state into a power-supply ON state; and 
 an interface to which a command signal to turn ON or OFF the power supply is input, 
 wherein, when the command signal to turn OFF the power supply is input to the interface, the interface sends a pseudo signal indicating that the device is detached from the slot to the controller to turn off the power supply. 
 
   
   
     10. The information processing apparatus according to  claim 9 , further comprising:
 a bus which is connected with the device; 
 a bus controller which controls the bus; 
 a sort determination unit which determines a sort of the device, after the power supply to the device has been started by the controller; and 
 a state changing unit which brings into a usable state, the bus controller which controls the bus connected with the device whose sort has been determined by the sort determination unit. 
 
   
   
     11. The information processing apparatus according to  claim 10 , wherein the device includes an openable tray; and
 the information processing apparatus further comprises: 
 an opening unit which opens the tray, after the bus controller has been brought into the usable state. 
 
   
   
     12. The information processing apparatus according to  claim 9 , further comprising:
 a display which displays content which signifies that the power supply state of the device is to be shifted from the power-supply OFF state into the power-supply ON state, the content is displayed before the instruction and selected by an user. 
 
   
   
     13. The device state control method according to  claim 1 , further comprising:
 recognizing a type of the connected device by accessing a resistor in the device, the resistor storing an information indicating the type of the device. 
 
   
   
     14. The device state control method according to  claim 1 , further comprising:
 recognizing a type of the connected device by reading a voltage value of a signal line, the signal line electrically connecting the information processing apparatus and the device. 
 
   
   
     15. The device state control method according to  claim 1 , further comprising:
 recognizing a type of the connected device by accessing a resistor in the information processing apparatus, the resistor storing an information indicating the type of the device. 
 
   
   
     16. The information processing apparatus of  claim 5 , further comprising:
 recognizing a type of the connected device by accessing a resistor in the device, the resistor storing an information indicating the type of the device. 
 
   
   
     17. The information processing apparatus of  claim 5 , further comprising:
 recognizing a type of the connected device by reading a voltage value of a signal line, the signal line electrically connecting the information processing apparatus and the device. 
 
   
   
     18. The information processing apparatus of  claim 5 , further comprising:
 recognizing a type of the connected device by accessing a resistor in the information processing apparatus, the resistor storing an information indicating the type of the device. 
 
   
   
     19. The information processing apparatus of  claim 9 , further comprising:
 recognizing a type of the connected device by accessing a resistor in the device, the resistor storing an information indicating the type of the device. 
 
   
   
     20. The information processing apparatus of  claim 9 , further comprising:
 recognizing a type of the connected device by reading a voltage value of a signal line, the signal line electrically connecting the information processing apparatus and the device. 
 
   
   
     21. The information processing apparatus of  claim 9 , further comprising:
 recognizing a type of the connected device by accessing a resistor in the information processing apparatus, the resistor storing an information indicating the type of the device.